Electrocatalytic oxidation and differential pulse voltammetric determination of hydroxylamine using a 4-hydroxy-2-(triphenylphosphonio)phenolatecarbon nanotubes modified electrode

Abstract

The electrocatalytic oxidation of hydroxylamine was studied at the surface of a carbon paste electrode (CPE) spiked with multi-wall carbon nanotubes (MWCNT) and 4-hydroxy-2-(triphenylphosphonio)phenolate (HTP). The modified electrode (HTP-MWCNT-CPE) exhibits an excellent electrochemical catalytic activity toward hydroxylamine oxidation. The results show that there is a dramatic enhancement on the anodic peak current of hydroxylamine oxidation at the HTP-MWCNT-CPE in comparison the value obtained at HTP-CPE and MWCNT-CPE. The kinetic parameters of the electron transfer coefficient, a, the heterogeneous electron transfer rate constant, k 0 , and the exchange current density, j 0 , for oxidation of hydroxylamine at the HTP-MWCNT-CPE were determined using cyclic voltammetry. Differential pulse voltammetry exhibits three dynamic linear ranges of 2.0-10.0 mM, 10.0-1000.0 mM and 1000.0-8000.0 mM, and a lower detection limit of 0.16 mM for hydroxylamine. Finally, the modified electrode activity was studied for hydroxylamine determination in two water samples and satisfactory results were obtained.

Fabrication, characterization and analytical performance of the hydroxylamine sensor based on an oracet blue multi-walled carbon nanotubes film deposited on an electrode surface

“…Figure 4A Table 2, the analytical parameters of electrocatalytic determination of hydroxylamine in this work are compared with the corresponding values previously reported for some other modified electrodes. 10,14,16,32,[40][41][42][43][44] It can be seen that the responses made by the proposed modified electrode are in most cases superior to the previously reported modified electrodes. The average current measured and the precision estimated in terms of relative standard deviation (RSD%) for fifteen repeated measurements (n = 15) of 10.0 µmol L -1 of hydroxylamine at the applied potential of 170 mV on OBMWCNT-GCE were 0.107 ± 0.003 µA and 2.9% respectively.…”

“…Also, a combination of MWCNT and a mediator (OB here) definitely improves the characteristics of hydroxylamine oxidation. Also, the peak potential of hydroxylamine oxidation at the OBMWCNT-GCE is less positive, in most cases, in comparison with those reported for electrodes modified with other mediators such as rutin, 14 nickel hexacyanoferrate, 16 a coumestan derivative, 32 gold nanoparticle-polypyrrole nanowire, 40 an indenedione derivative, 41 chlorogenic acid, 42 4-hydroxy-2-(triphenylphosphonio)phenolate, 43 and ruthenium oxide nanoparticles. 44 The oxidation potentials of hydroxylamine on different modified electrodes are shown in Table 2.…”

“…14,40,43 Amperometric studies of electrocatalytic oxidation of hydroxylamine at the OBMWCNT-GCE surface…”

“…Therefore, various methods have been reported for the determination of low levels of hydroxylamine from industrial, environmental, and health viewpoints. [34][35][36][37][38][39][40][41][42][43][44] These include chromatography, 34,35 spectrophotometric 37 and electrochemical methods. 10,11,14,16,32,[38][39][40][41][42][43][44] In this regard, we had reported the preparation of a rutin multi-walled carbon nanotubes modified glassy carbon electrode (RMWCNT-GCE), 14 a coumestan derivative modified carbon paste electrode, 32 an indenedione derivative MWCNT-GCE (IMWCNT-GCE), 41 a chlorogenic acid MWCNT-GCE (CGA-MWCNT-GCE), 42 a 4-hydroxy-2-(triphenylphosphonio)phenolate MWCNT-GCE (HTP-MWCNT-GCE), 43 a ruthenium oxide nanoparticles, 44 and their applications in hydroxylamine determination.…”

Electrocatalytic determination of morphine at the surface of a carbon paste electrode spiked with a hydroquinone derivative and carbon nanotubes

“…To the best of our knowledge, there is no report on the simultaneous determination of MO and AC by using a modified carbon paste electrode. To continue our studies on the fabrication of 4-hydroxy-2-(triphenylphosphonio)phenolate (HTP)/multi-wall carbon nanotubes modified carbon paste electrode (HTP-MWCNT-CPE) and its applications for the determination of different analytes [46][47][48], we have reported in this paper the application of HTP-MWCNT-CPE for the electrocatalytic oxidation of MO and the simultaneous determination of MO and AC. The results show that the modified electrode has important advantages such as wide linear concentration range, low detection limit, and good repeatability for MO determination.…”